1.small - big
2.born - trained
3.pleasant - unpleasant
4.long - short
5.unfriendly - friendly
6.tidy - untidy
7.healthy - unhealthy
8.cloudy - cloudless
9.fit - unfit
10.unwell - well
11.successful - unsuccessful
12.clean - dirty
13.beautiful - ugly
14.comfortable - uncomfortable
15.uninterested - interested